“Our analysts have not yet presented their conclusions and want to see more images which the (diving) company will send to us,” he said, adding that the results were expected “in the coming days.” Kallin said the military would “not speculate.”

According to Stefan Hogeborn, a diver from the Ocean X Team company that made the discovery, the vessel is “completely intact” with “no visible damage to the hull” and the hatches closed.

“It is unclear how old the submarine is and how long it has been laying at the sea floor, but the Cyrillic letters on the hull indicate that it is Russian,” he said in a statement.